Issue 5, 2013

Substitution effect on phenalenyl backbone in the rate of organozinc catalyzed ROP of cyclic esters

Abstract

A series of zinc complexes (1–6) supported by substituted phenalenyl ligands was synthesized by reacting the phenalenyl ligands with diethyl zinc under ethane evolution. The solid state structures of these complexes (1–6) were determined by single crystal X-ray crystallography. Furthermore, the organozinc complexes (4–6) were tested for the polymerization of cyclic esters as efficient catalysts for the ring-opening polymerization of ε-caprolactone (ε-CL) and rac-lactide (rac-LA) in the presence of benzyl alcohol (BnOH) as initiator. Complex 4 exhibited remarkably higher rate of polymerization under identical reaction condition than complexes 5 and 6. The polymerization of ε-caprolactone produced polymer with narrow polydispersities (Mw/Mn = 1.06 to 1.22), while the polymerization of lactide monomers afforded polylactides with polydispersity values ranging from 1.08 to 1.8. The kinetic experiments unravelled a controlled polymerization. The controlled nature of polymerization was further utilized in the preparation of the block copolymer poly(CL)block-poly(rac-LA).

Graphical abstract: Substitution effect on phenalenyl backbone in the rate of organozinc catalyzed ROP of cyclic esters

Supplementary files

Article information

Article type
Paper
Submitted
17 Sep 2012
Accepted
30 Oct 2012
First published
31 Oct 2012

Dalton Trans., 2013,42, 1893-1904

Substitution effect on phenalenyl backbone in the rate of organozinc catalyzed ROP of cyclic esters

T. K. Sen, A. Mukherjee, A. Modak, S. K. Mandal and D. Koley, Dalton Trans., 2013, 42, 1893 DOI: 10.1039/C2DT32152A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements